initial import of NetBSD tree

1 files changed, 117 insertions, 0 deletions

diff --git a/sys/lib/libkern/arch/sparc/ffs.S b/sys/lib/libkern/arch/sparc/ffs.S
new file mode 100644
index 00000000000..82599a412f1
--- /dev/null
+++ b/sys/lib/libkern/arch/sparc/ffs.S
@@ -0,0 +1,117 @@
+/*	$NetBSD: ffs.S,v 1.2 1994/10/26 06:39:57 cgd Exp $	*/
+
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This software was developed by the Computer Systems Engineering group
+ * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
+ * contributed to Berkeley.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Header: ffs.s,v 1.3 92/07/07 00:23:57 torek Exp
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+#ifdef notdef
+	.asciz "@(#)ffs.s	8.1 (Berkeley) 6/4/93"
+#endif
+	.asciz "$NetBSD: ffs.S,v 1.2 1994/10/26 06:39:57 cgd Exp $"
+#endif  /* LIBC_SCCS and not lint */
+
+#include "DEFS.h"
+
+/*
+ * ffs returns the number of the rightmost bit set in its argument,
+ * i.e., the lowest value such that (x & (ffs(x) - 1)) is nonzero.
+ * If no bits are set, ffs returns 0.
+ *
+ * We use a table lookup on each byte.
+ *
+ * In each section below, %o1 is the current byte (0, 1, 2, or 3).
+ * The last byte is handled specially: for the first three,
+ * if that byte is nonzero, we return the table value
+ * (plus 0, 8, or 16 for the byte number), but for the last
+ * one, we just return the table value plus 24.  This means
+ * that ffstab[0] must be -24 so that ffs(0) will return 0.
+ */
+ENTRY(ffs)
+#ifdef PIC
+	PICCY_SET(ffstab, %o2, %o5)
+#else
+	set	ffstab, %o2
+#endif
+	andcc	%o0, 0xff, %o1	! get low byte
+	be,a	1f		! try again if 0
+	 srl	%o0, 8, %o0	! delay slot, get ready for next byte
+
+	retl			! return ffstab[%o1]
+	 ldsb	[%o2 + %o1], %o0
+
+1:
+	andcc	%o0, 0xff, %o1	! byte 1 like byte 0...
+	be,a	2f
+	 srl	%o0, 8, %o0	! (use delay to prepare for byte 2)
+
+	ldsb	[%o2 + %o1], %o0
+	retl			! return ffstab[%o1] + 8
+	 add	%o0, 8, %o0
+
+2:
+	andcc	%o0, 0xff, %o1
+	be,a	3f
+	 srl	%o0, 8, %o0	! (prepare for byte 3)
+
+	ldsb	[%o2 + %o1], %o0
+	retl			! return ffstab[%o1] + 16
+	 add	%o0, 16, %o0
+
+3:				! just return ffstab[%o0] + 24
+	ldsb	[%o2 + %o0], %o0
+	retl
+	 add	%o0, 24, %o0
+
+ffstab:
+	.byte	-24,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1 /* 00-0f */
+	.byte	5,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* 10-1f */
+	.byte	6,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* 20-2f */
+	.byte	5,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* 30-3f */
+	.byte	7,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* 40-4f */
+	.byte	5,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* 50-5f */
+	.byte	6,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* 60-6f */
+	.byte	5,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* 70-7f */
+	.byte	8,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* 80-8f */
+	.byte	5,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* 10-9f */
+	.byte	6,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* a0-af */
+	.byte	5,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* b0-bf */
+	.byte	7,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* c0-cf */
+	.byte	5,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* d0-df */
+	.byte	6,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* e0-ef */
+	.byte	5,1,2,1,3,1,2,1,4,1,2,1,3,1,2,1	/* f0-ff */